This smudge was made with a pen tablet, which allows you to make much more delicate movements compared to a mouse. It can be done with a mouse aswell, but you'll have to smudge with like 1-4px smudge brush to get the same result, since a mouse doesn't allow pen pressure.
Smudging can't really be "taught" m8, and he/she used a tablet, with pen pressure on, as far as I know... that's how she got the "result", she got... as for video tutorials on smudging, I have yet to find one... I do know however, that at GFX Resource Forums there are a couple of speed-art smudge tutorials in the tutorial section, once you reach 30 posts and unlock the section... Sorry m8, not much else I can do for you
Tahko-The-VirusFeatured By OwnerJun 3, 2013Hobbyist Digital Artist
This is a great tut, exactly what I was looking for. A question though: Do you use a tablet to smudge? I feel like most smudges like this are accomplished by setting some stuff to "Pen Pressure" in the smudge settings and that can only be acquired by using a tablet.